Control Enable/Disable, Controller Mode

DCP200 Profile Controller & Recorder - Product Manual

Control Deviation

Control Deviation is the difference between the Process Variable value and the Actual Setpoint. The Control deviation error is equal to PV – SP. This value can be monitored using the bar-graph, and an excessive deviation warning can be given by using a deviation alarm.

Also refer to: Actual Setpoint, Alarm Types, Bar Graph, Deviation Alarm, Process Variable and Setpoint

Control Action

The primary power output direction. Reverse action is typically used with heating applications as it increases the correcting variable as the process variable falls. A secondary output’s

action is always the opposite of the primary output.
Settings = Reverse or Direct	Default value = Reverse.

Also refer to: Control Type, Correcting Variable, Direct Acting Control and Reverse Acting Control.

Control Enable/Disable

The PID controller outputs can be temporarily turned off by disabling the control. All other functions continue as normal. The control enable/disable function can be controlled from the Control Configuration sub-menu or optionally from Operation Mode or via a digital input if one is fitted.

Also refer to: Configuration Menu, Digital Input, Operation Mode and PID

Control Type

This defines if a controller has Single (unidirectional) or Dual (bidirectional) control outputs. Single outputs have a Primary output only. This can drive the PV in one direction (e.g. heat only, cool only, increase humidity etc). Dual outputs have both Primary and Secondary outputs which can force the PV to increase or decrease (e.g. heat & cool, humidify and

dehumidify etc).
Settings = Single or Dual	Default value = Single.

Also refer to: Control Action, PID, Primary Proportional Band, Process Variable, and Secondary Proportional Band.

Controller

An instrument that controls a process variable to a target setpoint, by applying a correcting variable. The controller uses proportional (P, PI, PD o PID) or On-Off control methods.

Also refer to: Correcting Variable, Indicator, Limit Controller, On-Off Control, PD Control, PI Control, PID, Process Variable, Proportional Control, Profiler and Setpoint.

Controller Mode

The normal operating mode when profiling is not fitted or it is not being used. Also refer to: Controller. Profiler and Profiler Mode

Correcting Variable

The amount of output from a controller used to adjust the process variable value up or down, to remove any control deviation. The correcting variable is commonly referred to as the controller output power.

Also refer to: Control Deviation, PID, Primary Power Output Limit and Process Variable

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Glossary

Page 139

DCP200 specifications

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Honeywell DCP200 manual Control Enable/Disable, Controller Mode

Models: DCP200